When it comes to syncing note-takers, there just isn't anything that gets the job done better…
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nvPY is free, syncs flawlessly with Simplenote and lets you store your notes in Dropbox or another cloud storage service so you can get to them on other systems, and even does partial auto-syncs in the background so you can work without having to save every five minutes. You can search note names and contents from the search bar, and the app supports Markdown. In fact, the only thing the app doesn't allow you to do is save your notes as a directory of plain text files instead of its own mini-database.

The app requires a little work to install, but once you have it up and running, it works flawlessly. If you use Notational Velocity on the Mac and want something similar for Linux and Windows, or you just wish it were available elsewhere, give nvPY a try.